What percent of teens say that they have viewed sexually explicit materials online?

The connections between the various aspects of an adolescent's microsystem is the

A) mesosystem. B) macrosystem. C) exosystem. D) microsystem.

In the United States in 1900, about 1 in ___ people in the general population were older adults; in 2010, about 1 in ___ people belong to this group; and by 2050 this group is expected to comprise 1 of every ___ U. S. residents

a. 50; 20; 10 b. 25; 12; 6 c. 25; 8; 5 d. 25; 20; 25